Abstract: The invention relates to a method and a system for the transparent transmission of data traffic between data processing devices, a corresponding program product, and a corresponding computer-readable storage medium, which can be used especially for transparently inserting, modifying, and/or removing data packets into/in/from the data traffic by introducing a second computer system (serially connected computer system) into the network interface of a main computer and processing the network traffic in the inventive manner. Individual packets and/or connections can be affected in a selective manner or all packets and/or connections can be affected as a whole. An important aspect of the invention lies in the fact that the serially connected computer system transmits data traffic between the main computer and a partner, the serially connected computer imitating the address properties of the main computer in relation to the partner and/or the address properties of the partner in relation to the main computer.

Abstract: A method and a computer system for securing communication in networks of data processing units which can be used especially for individually created security units for portable computer systems. In order to secure the communication, the data exchange between a data processing unit to be protected and the network is monitored and/or controlled by means of a computer program which is implemented in a security computer system as embedded software, the security computer system being inserted between the data processing device to be protected and the network. A computer system providing such protection is embodied as a single board computer or as a chip solution and comprises means for exchanging data with the data processing unit to be protected, means for exchanging data with the network, and means for monitoring and/or controlling the communication between the data processing unit to be protected and the network.

Abstract: The invention relates to a method and a system for the transparent transmission of data traffic between data processing devices, a corresponding program product, and a corresponding computer-readable storage medium, which can be used especially for transparently inserting, modifying, and/or removing data packets into/in/from the data traffic by introducing a second computer system (serially connected computer system) into the network interface of a main computer and processing the network traffic in the inventive manner. Individual packets and/or connections can be affected in a selective manner or all packets and/or connections can be affected as a whole. An important aspect of the invention lies in the fact that the serially connected computer system transmits data traffic between the main computer and a partner, the serially connected computer imitating the address properties of the main computer in relation to the partner and/or the address properties of the partner in relation to the main computer.

Abstract: The invention relates to a method and a computer system for securing communication in networks of data processing units which can be used especially for individually created security units for portable computer systems. In order to secure the communication, the data exchange between a data processing unit to be protected and the network is monitored and/or controlled by means of a computer program which is implemented in a security computer system as embedded software, the security computer system being inserted between the data processing device to be protected and the network. A computer system providing such protection is embodied as a single board computer or as a chip solution and comprises means for exchanging data with the data processing unit to be protected, means for exchanging data with the network, and means for monitoring and/or controlling the communication between the data processing unit to be protected and the network.